With specimen grips developed specifically for wire strand testing, ZwickRoell now offers the option to test strands without having to use specially attached clamping elements. This development substantially reduces the required handling, time, and expense for the user.
The grips feature hydro-mechanical and straight mechanical clamping. The latter comprises a conical sleeve into which each end of the strand is fed together with a counter-cone and clamped. Most of the gripping force is applied in this manner. The remaining portion still needed for the respective test is supplied by classical hydro-mechanical clamping via jaws. The combination of these two gripping principles enables the gripping force to be applied in such a manner that jaw breaks are eliminated and wire strands can be tested without being pretreated.
The specimen grips are extremely flexible and can be used for a wide range of applications. The variably adjustable hydraulic gripping force can be easily changed from test to test by regulating the oil pressure accordingly.
The specimen grips (Fmax 500 kN) are typically used with an HA series servo-hydraulic testing machine.